How does the Pollard script show tone?

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Hmong-Mien languages Distribution of Hmong-Mien language family in China and Southeast Asia.

The Pollard script, invented by Samuel Pollard for the A-Hmao language, indicates tone through the spatial positioning of its characters. The system utilizes primary symbols to represent consonants and smaller secondary symbols to represent vowels; the specific placement of these vowel symbols in relation to the consonant symbols—such as above or to the right—denotes the tone of the word.1